Pressure-exerting machine.



G. W. GREENWOOD.

PRESSURE EXERTING MACHINE.

APPLIOATION FILED JAN. 27, 1902.

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GEORGE IV. GREENWVOOD, OF CLEVELAND, OIIIO.

PRESSURE-EXERTING MACHINE.

3PECIFICATION forming part of Letters Patent No. 727.353, dated May 5,1903.

Application filed January 27,1902. Serial No. 91,459. (No model.)

pressure-exerting machines suitable for use in gripping, pressing, andforging operations-as, for instance, in gripping or exerting pressureagainst a blank or stock which is to be converted or formed into apredeter-- mined article of manufacture; and the invention pertains moreespecially to a machine of the character indicated which comprises asuitably-guided pressure-exerting block capable of reciprocation andactuated by a suitably-operated toggle-joint.

The primary object of this invention is to provide improved means foravoiding breakage of or injury to any portion of the mechanism of themachine by an excess of material to be operated upon by the pressure-exerting block or by any obstructing matter obtaining ingress to the spaceentered by the blank, stock, or material which is to be pressed againstor otherwise operated upon by the said block.

With this object in view and to the end of realizing other advantageshereinafter appearing the invention consists in certain features ofconstruction and combinations of parts hereinafter described, andpointed out in the claims.

In the accompanying drawings, Figure I is a top plan of a portion of apressure-exerting machine embodying my invention. Fig. 11 is a verticalsection on line II II, Fig. I, looking in the direction indicated. bythe arrow. Fig. III is a vertical section on line III III, Fig. II,looking in the direction indicated by the arrow. Fig. IV is a horizontalsection on line IV IV, Fig. 11, looking upwardly. Fig. V is aperspective view of a toggle-joint employed for the purpose hereinafterappearing; and Fig. V1 is a bottom plan of the travel arranged parallelwith the shaft b. The

shaft 1) and the block 71. are arranged, therefore, parallel and asuitable distance apart longitudinally of the bed a.

The block h is arranged to operate between two guide-forming'walls 5 and6, provided upon the bed a and arranged at the inner side and outerside,respectively, of the path of the said block.

The block h is operated bya togglejoint arranged at one end of the saidblock'h between the said block it and a thrust-block 'n. The knuckle mof the said toggle-joint has a shank or arm 7 extending toward the head30 of a slide 25 and pivoted vertically, as at 8, to the said head. Theslide 25 is capable of reciprocation and arranged to operate be tweenthe shaft 1) and the travel of the block it. The said toggle-joint is,therefore, operatively connected at its knuckle m with the head 30, andthe slide 25 is operatively connected by a pitman e with the crank 9 ofthe shaft 1), and the bed a is provided with walls 10, arranged to formguides for the said slide.

The two links rand t of the toggle-jointconnect the toggle-knuckle mwith the blocks '22 and h, respectively. The toggle-joint is applied inthe usual manner, having opposite ends of its link '15 pivotedvertically, as atf, to the toggle-knuckle and to the block it,respectively, and having opposite ends of its other link 1" pivotedvertically, as at g, to the toggle-knuckle m and to the thrustblockn,'respectively.

The block it is provided at the bottom and at'itstoggle-joint-connectiug.end with a flat horizontallyarranged extension70, which normally extends in under the toggle-joint. The blockextension is provided at its outer side edge with an upwardly-projectingflange 18, extending from the block proper to the outer or free end ofthe extension 75. The flange 18 has hearing at its outer side againstthe inner surface of the adjacent portion of the bar 6, which extendsalong the said flange toward the thrust-block n.

The slide 25 of the machine illustrated being employed in transmittingpower to the aforesaid toggle-joint is properly termed a toggle-slide,and the head or part 30 being directly connected with the arm 7 of theknuckle of the said toggle-joint is properly called a toggle-slide head.The toggleslide 25 rests upon the bottom of the recess or slidewayformed between the walls 10. The toggle-slide head 30 is arranged withinand movable endwise of a correspondinglyshaped chamber 26, which isformed in and extends longitudinally and is open atthe outer end of theslide 25. The pivot 8 extends through the arm 7 into the head 30 and notinto the slide 25; but the pitman e is attached directly to the slide 25and not to the head 30. During the operation of the pitman e the head 30moves with the slide 25, so as to result in the actuation of theaforesaid toggle-joint; but the head 30 is yieldingly held in positionwithin the slide 25, as will hereinafter clearly appear.

The block it should adequately engage and operate upon the stock, blank,or material (not shown) to be engaged or pressed against, and thearrangement of the parts is such, therefore, that the block h shall havecommenced to operate before the toggle-slide 25 has completed its strokein the direction of the said block 72, and the toggle-slide head 30shall be capable of yielding, if necessary, during the said stroke afterthe block it has commenced to engage the work, as aforesaid, so that theliability of any excess of material or obstructing matter against whichthe block it is actuated resulting in breakage or injury to the togglejoint and connected parts is reduced to a minimum.

The subject-matter of this application pertains to improvements inconnection with the yieldable means acting to retain the toggleslidehead 30 in its normal position within the toggle-slide 25, and the saidyieldable means comprises a vertically movable or yieldable block j,which is arranged within and movable endwise of the chamber of a case27, which is formed upon the top of the toggle-slide 25. The case 27 ispreferably cylindrical and screw-threaded internally at its outer endand engaged by a correspondingly-threaded plug 10, which closes theouter end of the said case, and a spring 8 is confined within thechamber of the case 27 between the opposing surfaces of the plug 13 andthe blockj.

The case 271s enlarged at its lowerend, as at 17, longitudinally of thetoggle-slide 25, and the lower portion of the chamber of the said caseis correspondingly enlarged longitudinally of the said slide andconnects with the chamber 26 in the said slide and is in open relationat the said end with a chamber 31, formed in the upper portion of thetoggle-slide head 30.

A toggle-joint or toggle device is arranged at the under side of theblock j, between the said block j and the toggle-slide head 30, andextends from within the lower enlarged end of the case 27, at a pointbetween the block j and the inner end of the toggle-slide 25, downwardlyandin the direction of the outer end of the head 30 and into the chamber31 of the said head. The said toggle-joint or toggle device is arrangedwith its knuckle centrally of the under side of the blockj and engaginga recess 16, formed in the under side of the said blockj. The saidlast-mentioned toggle-joint or toggle device has therefore one of itslinks and link a; in the case illustrated arranged in the main withinthe enlarged lower end of the chamber of the case 27 and pivoted, as atu, horizontally and transversely of and to the toggle-slide 25 at thelower end of the said case. The said link 00 extends from the pivotdownwardly and in the direction of the outer end of the toggle-slidehead 30 to the under side of the blockj and terminates below the saidblock j in a cylindrical tubular journal 15, which is arrangedhorizontally and transversely of the said head parallel with the pivot uand has hearing within the recess 16 of the block j against the underside of the said blockj. The other link y of the toggle-joint or toggledevice now being described extends from withinthejournal of the link 00preferably downwardly and in the direction of the outer end of thetoggle-slide head and is arranged in the main within the chamber 31 ofthe said head and terminates at its lower end in a journal 14, which isarranged horizontally and extends transversely of the said head parallelwith the journal 15 and forms the pivotal connection between the saidlink 1 and the said head and has bearing upon the bottom of the saidchamber 31. Thelink y has its opposite or upper end terminating in ajournal 13, which has bearing within and is arranged parallel with andextends from end to end of the journal 15.

The journal 15 has its lower portion slotted laterally andlongitudinally, as at 12, to accommodate the location and movement ofthe link y during the operation of the toggle-joint comprising the saidlink y. The journal 15 has one end thereof completely surrounding thejournal 13, as at 0, as shown in Figs. V and VI, and the slot 12 extendsto and is open at the opposite end of the said journal 15 at the bottomof the journal, as at d; but the end 61 of the slot 12 is just wideenough to receive the body portion of the link y, so that the journal 13of the link 3 can only be introduced endwise into the journal 15 of thelink by placing the link y in the position shown in dotted lines, Fig.V, and the body portion of the link y is out of line with the open end dof the slot 12 when the said toggle-joint is applied and remains thusout of line with the said open end of the said slot during the operationof the toggle-joint, so that the members of the said joint cannot getout of order during the operation of the joint, and the chamber 31 hasthe dimensions required to accommodate the location and operation of thesaid joint. The spring sis normally compressed or under tension and,through the medium of the block j and the toggle-joint, which has itsknuckle bearing the said block, as already indicated, retains thetoggle-slide head 30 in its outer and normal position. The spring 5 issufficiently powerful to retain the toggle-slide head 30 in its normalposition until an abnormal excess occurs in the work provided for thepressureeXerting block or plunger.

The arrangement of parts is such that in the outer and normal positionof the toggleslide head 30 the links so and y are arranged somewhat outof line in the direction of the block j, but not enough to cause thesaid joint to yield too readily at the commencement of the inwarddisplacement of the said head independently of the toggle-slide 25; butobviously the said links x and y will readily yield in the directionrequired to elevate the blockj against the action of the spring 8 assoon as the toggle-joint comprising the said links so and y has fairlybegun to elevate the said block j, and the said toggle-joint veryefficiently performs its functions.

To prevent the toggle-slide head 30 from being pushed or actuatedoutwardly beyond its normal position, and consequently to avoid themovement of the links 00, and 3 into line, a stop is provided andcomprises, preferably, a pin w,which extends horizontally andtransversely of and through the said head atright angles to the line oftravel of the slide 25 into engagement with slots 28, formed in andextendinglongitudinally of the side walls of the chamber 26 of the saidslide. In the normal position of the parts the pin to engagesthe forwardend walls of the slots 28, as shown in Fig. IV. The pin to and theforward end walls of the slots 28 form an efficient stop for limitingthe outward movement of the toggleslide head 30 by the action of thespring 3.

What I claim is-- 1. Thecombinatiomwitha slide,andahead movablelongitudinally and independently of the said slide, of a toggle-joint ortoggle device having its two links pivotally connected to the said slideand to the aforesaid head, respectively, a yieldable block normallybearing against the knuckle of the toggle device, and a suitably-appliedspring acting to retain the said yieldable block in its normal position.

2. The combination,with a slide, and a head movable longitudinally andindependently of the said slide, of a toggle-joint or toggle devicehaving its two links pivotally connected to the said slide and to theaforesaid head, respectively, a yieldable block normally bearing againstthe knuckle of the toggle device, a suitably-applied spring acting toretain the said yieldable block in its normal position, and means forpreventingthe aforesaid head from being moved outwardly beyond in itsnormal position, substantiallyas and for the purpose set forth.

3. Thecombination,withaslide,ahead-supported from and movablelongitudinally and independently of the said slide, and means forreciprocating the said slide, of a togglejoint connected, at one end, tothe said slide outside of the aforesaid head and extending in thedirection of the outer end of the head; yieldable means acting to causethe togglejoint to push the head outwardly, and means preventing thehead from being actuated outwardly beyond its normal position, and thearrangement of the parts being such that the toggle-joint, in the normalposition of the head, shall have its links'arranged somewhat out of linein the direction of the aforesaid yieldable means.

4. The combination, with a positively-actuated slide, a head supportedfrom and movable longitudinally and independently of the said slide, andmeans for reciprocating the said slide, of a toggle-joint pivotallyconnected, at one end, with the said slide and having its other endarranged to push the aforesaid head outwardly; yieldable means actingagainst the knuckle 0f the toggle-joint, and means for preventing thesaid head from being actuated outwardly beyond its normal position, andthe arrangement of the parts being such that the links of thetoggle-joint shall be normally out of line in a direction opposite tothe direction of action of the aforesaid yieldable means.

5. Thecombination,withapower-transmitting slide, and a head supportedfrom and movable longitudinally and independently of the said slide, andmeans for reciprocating the said slide, of a toggle-joint connected, atone end, to the said slide outside of and above the aforesaid head andextending downwardlyin the direction of the outer end of the head;yieldable means acting downwardly upon the knuckle of the toggle-joint,and means preventing the said head from being actuated outwardly beyondits normal position, and the arrangement of the parts being such thatthe toggle-joint, in the normal position of the said head, shall haveits links arranged somewhat out of line upwardly, substantially as andfor the purpose set forth.

6. The combination,withapower-transmitting slide, and a head supportedfrom and movable longitudinally and independently of the said slide, andmeans for reciprocating the said slide, of a toggle-joint connected, atone end, to the said slide and having bearing, at its other end, in theaforesaid head; a block mounted upon the knuckle of the toggle-joint;means acting to depress the said block, and means preventing theaforesaid head from being actuated outwardly beyond ally connected, atone end, to the said slide and having its other end arranged to push theaforesaid head outwardly; yieldable means acting against the knuckle ofthe toggle-joint, and means for preventing the said head from beingactuated outwardly beyond its normal position, and the arrangement ofthe parts being such that the links of the toggle-joint shall benormally out of line in a direction opposite to the direction of actionof the aforesaid yieldable means, and the knuckle of the said jointcomprising a journal formed on one of the links of the joints and havingbearing in a hollow cylindrical journal formed on the other link of thesaid joint, with the said hollow journal having a lateral slot arrangedto accommodate the location and operation of the first-mentioned linkand open at one end, substantially as and for the purpose set forth.

8. In a machine of the character indicated, a power-transmitting slidecomprising a slide; a head supported from and movable longitudinally andindependently of the said slide; means for reciprocating the said slide;a toggle-joint pivotally connected, at one end, to the said slide andhaving its other end arranged to push the aforesaid independentlymovablehead outwardly; a yieldable block normally bearing against the knuckleof the toggle-joint; a suitably-applied spring acting to retain the saidblock in its normal position,

and means for preventing the aforesaid head from being actuatedoutwardly beyond its normal position, and the arrangement of the partsbeing such that the links of the togglejoint shall be normally out ofline in the direction of the aforesaid block, and the said block beingrecessed upon its toggle-facing side to receive and affording bearing tothe toggle-knuckle.

9. In a machine of the character indicated, a power-transmitting slide;a head supported from and movable longitudinally and independently ofthe said slide; means for reciprocating the said slide; a toggle-jointpivotally connected, at one end, to the said slide and above theaforesaid head and extending in the direction of the outer end of andinto the said head and arranged with the axis of its knuckletransversely of the said head; yieldable means bearing downwardly uponthe said knuckle; means for preventing the said head from being actuatedoutwardly beyond its normal position, and a casesurrounding theaforesaid yieldable means and enlarged at its lower end longitudinallyof the aforesaid slide, and the arrangement of the parts being such thatthe links of the togglejoint shall be normally out of line in adirection opposite to the direction of action of the aforesaid yieldablemeans, and the aforesaid case and the said slide and the aforesaid headbeing chambered to accommodate the location and operation of thetoggle-joint and the aforesaid yieldable means.

In testimony whereof I sign the foregoing specification,in the presenceof two witnesses, this 22d day of January, 1902, at Cleveland, Ohio.

GEORGE W. GREEN WOOD.

Witnesses:

O. H. DORER, TELSA SCHWARTZ.

